Bootcamp missing in windows 8.1

Hello all,

I have installed windows 8.1 in my OS X Mavericks via bootcamp. It ran perfectly and when Windows first started, everything was wonderful. I could see Bootcamp on my taskbar, which means drivers were all enabled to Windows. Problem started when i switched my account to a Windows LIVE account. Boom, suddenly Bootcamp went missing. Keyboard, sound, and some others are not functioning. What should i do? Thanks in advance to everyone who can share.